我有一个Account类，其中包含Payments列表，其中包含Products，Pending或{{1}的Sold列表}}
选择要付费的Refunded时，我可以将它们添加到Products对象中，然后将整个对象保存到Payment。
但是，当我在Account操作中检索帐户时，Pay为空。
以下是Account.Payments操作：
AddProduct public ActionResult AddProduct(List<Product> products)
{
//var acc = Account.FetchAccountFromIdentity(User.Identity.GetUserName());
var username = User.Identity.GetUserName();
var acc = db.Accounts.First(u => u.EmailAddress == username);
var payment = new Payment();
foreach (var product in products)
{
if (product.IsSelected)
{
var tempProduct = db.Products.Find(product.ProductID);
payment.Products.Add(tempProduct);
payment.PaymentStatus = enPaymentStatus.Pending;
payment.Gross += tempProduct.Price;
payment.Vat += tempProduct.Price * 0.2;
payment.Net += payment.Gross - payment.Vat;
}
}
payment.AccountID = acc;
if (acc.Payments == null) acc.Payments = new List<Payment>();
acc.Payments.Add(payment);
db.SaveChanges();
return RedirectToAction("Pay", "Products", new {id = acc.AccountID} );
}
此时已正确填充任何相关付款。
然后是acc.Payments动作：
Pay public ActionResult Pay(int? id)
{
var acc = db.Accounts.Find(id);
var data = new AccountPaymentView
{
Account = acc,
Payment = acc.Payments.First(p => p.PaymentStatus == enPaymentStatus.Pending)
};
return View(data);
}
现在为空！？
知道我一定做错了什么？
修改的 现在使用帐户类：
acc.Payments编辑2 这是DBContext上的OnModelCreating方法（删除了不相关的部分）。我找不到一些明显的东西？
public class Account
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int AccountID { get; set; }
[Display(Name = "Title")]
public string Salutation { get; set; }
[Required]
[Display(Name = "First Name")]
public string FirstName { get; set; }
[Required]
[Display(Name = "Last Name")]
public string LastName { get; set; }
[Required]
[DataType(DataType.Password)]
[Display(Name = "Password")]
public string Password { get; set; }
[Required]
[DataType(DataType.Password)]
[Compare("Password", ErrorMessage = "Passwords do not match. Please try again.")]
[Display(Name = "Confirm Password")]
public string ConfirmPass { get; set; }
[Required]
[DataType(DataType.EmailAddress)]
[Display(Name = "Email Address")]
public string EmailAddress { get; set; }
public virtual ICollection<Address> Addresses { get; set; }
public virtual ICollection<Payment> Payments { get; set; }
public DateTime CreatedOn { get; set; }
public virtual ICollection<DateTime> VistsList { get; set; }
public bool IsDeleted { get; set; }
public enAccountType AccountType { get; set; }
}
编辑3 检出Account.FetchAccountFromIdentity（），它确实打开了一个新的上下文。所以现在已经删除了，现在我在AddProduct方法中使用了一个上下文（上面更新的代码）。
现在我在保存时遇到以下错误!!!
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.Properties<DateTime>()
.Configure(c => c.HasColumnType("datetime2"));
modelBuilder.Entity<Account>().HasOptional(x => x.Addresses).WithMany();
modelBuilder.Entity<Account>().HasOptional(x => x.Payments).WithMany();
modelBuilder.Entity<Payment>().HasOptional(x => x.Products).WithMany();
modelBuilder.Entity<Payment>().HasOptional(x => x.AccountID);
modelBuilder.Entity<Payment>().HasKey(x => x.PaymentID);
}
我尝试在OnModelCreating方法中强制PK关系，但它似乎没有帮助。
为清楚起见，这是付款类：
An object of type 'System.Collections.Generic.List`1[[PPPv2.Models.Payment, PPPv2,
Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]'
cannot be set or removed from the Value property of an EntityReference of type 'PPPv2.Models.Payment'.
编辑4 根据要求，这是产品型号：
public class Payment
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int PaymentID { get; set; }
public virtual Account AccountID { get; set; }
public virtual ICollection<Product> Products { get; set; }
public double Gross { get; set; }
public double Net { get; set; }
public double Vat { get; set; }
public string TransactionCode { get; set; }
public enPaymentStatus PaymentStatus { get; set; }
public bool IsDeleted { get; set; }
public DateTime PaidOn { get; set; }
public Payment()
{
Products = new List<Product>();
Gross = 0.0;
Net = 0.0;
Vat = 0.0;
IsDeleted = false;
PaidOn = new DateTime(2000, 1, 1, 0, 0,0);
}
}
答案 0 :(得分：3)
如果查看实体框架生成的表格，您将看到其中只有三个。根据您的数据模型，应该存在将Account和Payment对象相互映射的联结表（同样适用于Payment和Product，您很可能需要对你拥有的其他收藏品做同样的事情。）
由于您的数据模型表明List是一个集合，但数据库表是{1}}，因此您无法将Products Products转换为单个实际上将其存储为Payment和Product之间的外键（即单一实体）关系。
如果我将OnModelCreating方法中的代码更改为以下内容，则AddProducts方法将按预期工作。
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.Properties<DateTime>().Configure(c => c.HasColumnType("datetime2"));
modelBuilder.Entity<Account>().HasMany(x => x.Addresses)
.WithMany().Map(t => t.ToTable("AccountAddresses"));
modelBuilder.Entity<Account>().HasMany(x => x.Payments)
.WithMany().Map(t => t.ToTable("AccountPayments"));
modelBuilder.Entity<Payment>().HasMany(x => x.Products)
.WithMany().Map(t => t.ToTable("PaymentProducts"));
modelBuilder.Entity<Payment>().HasOptional(x => x.AccountID);
modelBuilder.Entity<Payment>().HasKey(x => x.PaymentID);
}
改变来自以下代码：
modelBuilder.Entity<Payment>().HasOptional(x => x.Products).WithMany();
要：
modelBuilder.Entity<Payment>().HasMany(x => x.Products).WithMany().Map(t => t.ToTable("PaymentProducts"));
这样做会指示实体框架创建允许Payment保存Products集合的联结表。
答案 1 :(得分：0)
创建付款时，您应将其直接保存到数据库中。我不认为将其添加到您的帐户对象会起作用，因为它是一个尚未被EF跟踪的实体。
public ActionResult AddProduct(List<Product> products)
{
//var acc = Account.FetchAccountFromIdentity(User.Identity.GetUserName());
var username = User.Identity.GetUserName();
var acc = db.Accounts.First(u => u.EmailAddress == username);
var payment = new Payment();
foreach (var product in products)
{
if (product.IsSelected)
{
var tempProduct = db.Products.Find(product.ProductID);
payment.Products.Add(tempProduct);
payment.PaymentStatus = enPaymentStatus.Pending;
payment.Gross += tempProduct.Price;
payment.Vat += tempProduct.Price * 0.2;
payment.Net += payment.Gross - payment.Vat;
}
}
payment.AccountID = acc.AccountID;
db.Payments.Add(payment);
db.SaveChanges();
return RedirectToAction("Pay", "Products", new {id = acc.AccountID} );
}